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I want something leak proof that we can use anywhere. My son only drinks from straw cups and since he used the Tommee Tippee bottles with no problems I figured we wouldn't have any problems with these cups either. You do need to read the directions with the cups so you know how to properly wash them and put them back together. If you don't put them together just right they will not allow you to drink through the straw and because of that they are difficult to use. These cups do leak a little bit once in a while too. I am going to keep trying them for a couple more days to see if they become easier to use but in the meantime I am also looking for a better straw cup.

These are the best straw cups I've found. They only leak if there is milk in the straw when you close it. Make sure you read the instructions fully because if you don't put them back together right, they will not work. Once you get the hang of it, it's easy. They are dishwasher safe on the top rack. One of my cups got water between the insulated part and outter plactic. Tommee Tippee customer service was very friendly and easy to work with.